CVE-2021-27248

Root code execution via getpage stack overflow

Published Apr 14, 2021 · Updated Aug 3, 2024

Stack-based buffer overflow in webproc on D-Link DAP-2020 1.01rc001 allows attackers to execute code as root from an adjacent network. The CGI handler copies the user-controlled getpage parameter into a fixed-length stack buffer without first validating its length. Unauthenticated access from an adjacent network is sufficient to corrupt the process stack and gain root-level execution on the access point.

CVSS severity8.8
High
EPSS probability2.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in webproc on D-Link DAP-2020 1.01rc001 allows attackers to execute code as root from an adjacent network. The CGI handler copies the user-controlled getpage parameter into a fixed-length stack buffer without first validating its length. Unauthenticated access from an adjacent network is sufficient to corrupt the process stack and gain root-level execution on the access point.

The record

CVE
CVE-2021-27248
Published
Apr 14, 2021
Updated
Aug 3, 2024
Vendor
D-Link
Product
DAP-2020
Classifications
CWE-121, T1210
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 14, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=v1.01rc001

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

D-Link · DAP-2020version=v1.01rc001

Published CVSS scores

8.8Zero Day InitiativeCVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.8NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.3NIST NVDAV:A/AC:L/Au:N/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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